66652 Borasisi
binary trans-Neptunian object
66652 Borasisi, or as a binary (66652) Borasisi–Pabu (provisional designation 1999 RZ253), is a binary classical Kuiper belt object. It was discovered in September 1999 by Chad Trujillo, Jane X. Luu and David C. Jewitt and identified as a binary on 23 August 2003 by K. Noll and colleagues using the Hubble Space Telescope.
Binary
In 2003 it was discovered that Borasisi is a binary with the components of comparable size (about 100–130 km) orbiting the barycentre on a moderately elliptical orbit. The total system mass is about 3.4 × 1018 kg.
The companion (66652) Borasisi I, named Pabu, orbits its primary in 46.2888 ± 0.0018 days on an orbit with a semi-major axis of 4528 ± 12 km and an eccentricity 0.4700 ± 0.0018. The orbit is inclined with respect to the observer by about 54° meaning that is about 35° from the pole-on position.
Physical properties
The surface of both components of the Borasisi–Pabu system is very red.
Naming
Borasisi is named after a fictional creation deity taken from the novel Cat's Cradle by Kurt Vonnegut. In the book, Borasisi is the Sun and Pabu is the name of the Moon:
Borasisi, the sun, held Pabu, the moon, in his arms, and hoped that Pabu would bear him a fiery child. But poor Pabu gave birth to children that were cold, that did not burn; and Borasisi threw them away in disgust.
“66652 Borasisi” enters the record as binary trans-Neptunian object. Crown Archives preserves that source wording while asking what Borasisi, binary and trans-Neptunian can confirm, complicate or overturn.
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“66652 Borasisi” is worth following because a concise public description often conceals a longer documentary argument. Here, Borasisi, binary and trans-Neptunian provides the most credible route into that argument.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 7, 2026. The linked authority identifier is Q156341. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1999, 2003 and 1018.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “66652 Borasisi” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.